Bump pkgrel, remove duplicate dependency coin

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = freecad-git
 	pkgdesc = A general purpose 3D CAD modeler - git checkout
 	pkgver = 0.18.r26.g51fcdd2c0
-	pkgrel = 1
+	pkgrel = 2
 	epoch = 1
 	url = https://www.freecadweb.org/
 	arch = x86_64
@@ -20,7 +20,6 @@ pkgbase = freecad-git
 	depends = hicolor-icon-theme
 	depends = libspnav
 	depends = opencascade
-	depends = coin
 	depends = libtheora
 	depends = med
 	depends = jsoncpp

PKGBUILD

@@ -10,7 +10,7 @@ arch=('x86_64')
 url='https://www.freecadweb.org/'
 license=('LGPL')
 depends=('boost-libs' 'curl' 'hicolor-icon-theme' 'libspnav' 'opencascade'
-         'coin' 'libtheora' 'med' 'jsoncpp' 'xerces-c'
+         'libtheora' 'med' 'jsoncpp' 'xerces-c'
          'python2-netcdf4' 'python2-pivy' 'python2-pyside2'
          'qt5-svg' 'qt5-webkit')
 makedepends=('git' 'boost' 'cmake' 'desktop-file-utils' 'pyside2-tools'